From owner-freebsd-fs@FreeBSD.ORG Tue Jul 5 12:17:48 2011 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 0223D106564A for ; Tue, 5 Jul 2011 12:17:48 +0000 (UTC) (envelope-from michael@fuckner.net) Received: from dedihh.fuckner.net (dedihh.fuckner.net [81.209.183.161]) by mx1.freebsd.org (Postfix) with ESMTP id AB7108FC1B for ; Tue, 5 Jul 2011 12:17:47 +0000 (UTC) Received: from dedihh.fuckner.net (localhost [127.0.0.1]) by dedihh.fuckner.net (Postfix) with ESMTP id DAB2B182C9; Tue, 5 Jul 2011 14:17:46 +0200 (CEST) X-Virus-Scanned: amavisd-new at fuckner.net Received: from dedihh.fuckner.net ([127.0.0.1]) by dedihh.fuckner.net (dedihh.fuckner.net [127.0.0.1]) (amavisd-new, port 10024) with SMTP id 0IrAiPhUwb1w; Tue, 5 Jul 2011 14:17:40 +0200 (CEST) Received: from c64.rebootking.de (e176137029.adsl.alicedsl.de [85.176.137.29]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by dedihh.fuckner.net (Postfix) with ESMTPSA id 1A277182BF; Tue, 5 Jul 2011 14:17:40 +0200 (CEST) Message-ID: <4E1300E3.9070602@fuckner.net> Date: Tue, 05 Jul 2011 14:17:39 +0200 From: Michael Fuckner User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc15 Lightning/1.0b3pre Thunderbird/3.1.10 MIME-Version: 1.0 To: gerrit.kuehn@aei.mpg.de References: <1309793921.2618.YahooMailRC@web120016.mail.ne1.yahoo.com> <4E1212A7.70405@feral.com> <4E1224BE.1020508@cran.org.uk> <20110704211522.GA43675@icarus.home.lan> <20110705090039.17321256.gerrit@pmp.uni-hannover.de> <4E12C34A.8030409@fuckner.net> <20110705101039.701cc042.gerrit@pmp.uni-hannover.de> <4E12CD57.7030403@fuckner.net> <20110705110721.7506f649.gerrit@pmp.uni-hannover.de> In-Reply-To: <20110705110721.7506f649.gerrit@pmp.uni-hannover.de> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-fs@freebsd.org Subject: Re: Are thumpers still interesting in 2011 ? (raidz3 on x4500 @ 3.0gbps ...) X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Jul 2011 12:17:48 -0000 On 07/05/2011 11:07 AM, Gerrit K=FChn wrote: Hi Gerrit, > I think then I get an SFF8087 lane (or even infiniband, which is even > more expensive) with 24 drives connected and face the same issue: which > controller do I connect this to? You mean like CX4 Connectors for SAS or Infiniband over CX4/ QSFP Connectors? I'd stick with LSI 9211-4i + 846E16 Chassis (http://www.supermicro.nl/products/chassis/4U/846/SC846E16-R1200.cfm) SAS Controllers (HBA or RAID) typicially use Chips with 8 external Ports. If you buy a Controller with more ports, they solder an Expanderchip to the raidcard (LSI SAS2x36, http://lsi.com/products/storagecomponents/Pages/LSISAS2x36.aspx or PMC PM8005, http://www.pmc-sierra.com/products/details/pm8005/). So in both ways (HBA with 24 ports, single cables to each HDD) or HBA with 4/8 ports, Expanderchip on the backplane), the topology is identical- and the expandersolution has less cabeling which makes the whole system more reliable. Regards, Michael!